EP1260780A1 - Drying plant and method for drying wood - Google Patents
Drying plant and method for drying wood Download PDFInfo
- Publication number
- EP1260780A1 EP1260780A1 EP00975053A EP00975053A EP1260780A1 EP 1260780 A1 EP1260780 A1 EP 1260780A1 EP 00975053 A EP00975053 A EP 00975053A EP 00975053 A EP00975053 A EP 00975053A EP 1260780 A1 EP1260780 A1 EP 1260780A1
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- EP
- European Patent Office
- Prior art keywords
- drying
- drying chamber
- air
- furnace
- internal space
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/02—Heating arrangements using combustion heating
- F26B23/028—Heating arrangements using combustion heating using solid fuel; burning the dried product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
- F26B25/006—Separating volatiles, e.g. recovering solvents from dryer exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
- F26B2210/16—Wood, e.g. lumber, timber
Definitions
- the invention relates to drying equipment and can be used in timber industry, woodworking and other branches of industry, whenever parameters and procedures necessary to dry materials as wood are used.
- Drying plants are known from prior art that include a batch-operating drying chamber and a furnace located near it, in which woodworking waste products may be and are primarily used as fuel to generate heat necessary for drying.
- the furnace gases or a mixture of furnace gases with air are used in such systems (e.g., see, Spravochnik po sushke drevesiny (Wood-drying reference book) edited by E.S. Bogdanov, Moscow, Lesnaya promyshlennost, 1990, pp. 38-63, patent RU 2105941, and the following inventor's certificates: SU:380454, JP09223628, JP11094460, JP11201639, JP11241883).
- the subject of the present invention is to ensure higher ecological safety and provide a highly productive, power-saving drying process, allowing to produce high quality dried materials.
- the proposed drying plant is not expensive, simple in maintenance and does not require highly qualified personnel.
- the drying plant can be installed either in existing premises or in the form of a separate premise, e.g. at lumbering sites.
- the proposed drying method is as follows: stack the wood into the free internal space of the drying chamber, close the chamber, and supply a hot drying agent (the air heated in the pipes located in the furnace flue) into the chamber.
- the woodworking waste products are the primary fuel used in the furnace.
- the air is forcedly circulated from pipes located in the furnace flue to the lower part of the free internal space of the drying chamber, and from the upper part of the free internal space of the drying chamber into the pipes of the furnace flue, and backwards.
- a portion of cooled and humidified air from the upper part of the free internal space of the drying chamber is forcedly supplied into the condensate cleaning unit, where it is mixed with the furnace gases, which are also forcedly supplied into the unit for purification; on their way to the cleaning unit, the furnace gases pass through a cavity located in the bottom of the drying chamber providing additional heating of the chamber.
- Air circulation from the pipes of the furnace flue to the lower part of the free internal space of the drying chamber and from its upper part into the pipes located in the furnace flue, and forced supply of furnace gases through an exhaust pipe into the cavity in the bottom of the drying chamber and then into the condensate cleaning unit, as well as forced supply of a portion of cooled and humidified air from the upper part of the free internal space of the drying chamber into the condensate cleaning unit, is realized with the aid of three appropriate exhaust ventilators.
- the pressure in the free internal space of the drying chamber falls slightly during drying. Humidity conditions can be adjusted by releasing vapor from the upper part of the free internal space of the drying chamber into atmosphere.
- Temperature conditions can be regulated by adjusting air circulation intensity from the pipes of the furnace flue to the lower part of the free internal space of the drying chamber and from the upper part of the free internal space of the drying chamber into the pipes; temperature conditions can also be regulated by adjusting the temperature of the drying agent (air), which depends on burning intensity and the amount of fuel in the furnace.
- the proposed method for drying wood may be realized as a drying plant consisting of a heat-insulated drying chamber with a free internal space, a furnace located close to the drying chamber, and facilities for supplying drying agent from the furnace into the drying chamber.
- the bottom of drying chamber is designed with two cavities horizontally arranged and hermetically separated from each other. The partition between these cavities is made of diathermic material.
- the lower cavity in the bottom of the drying chamber is designed in such a way as to provide forced feeding of furnace gases into the cavity from the exhaust pipe of the furnace flue.
- the upper cavity located in the bottom of the drying chamber is designed in such a way as to provide supply of the air heated in the furnace flue into the cavity; in the upper cavity, the heated air is distributed among air distribution channels to interact with the material to be dried located in the free internal space of the drying chamber at specially arranged places. There is a possibility to provide forced feeding of a portion of the air cooled and humidified during drying from the upper part of the free internal space of the drying chamber into the furnace flue.
- the drying plant is equipped with a condensate cleaning unit located outside the drying chamber; the furnace gases are forcedly fed into the unit after they pass through the lower cavity in the bottom of the drying chamber; also, a portion of cooled and humidified air is forcedly fed into the unit from the upper part of the free internal space of the drying chamber for mixing up with the furnace gases to form a condensate; after that, the purified air is exhausted into atmosphere.
- a condensate cleaning unit located outside the drying chamber; the furnace gases are forcedly fed into the unit after they pass through the lower cavity in the bottom of the drying chamber; also, a portion of cooled and humidified air is forcedly fed into the unit from the upper part of the free internal space of the drying chamber for mixing up with the furnace gases to form a condensate; after that, the purified air is exhausted into atmosphere.
- the facilities that forcedly supply furnace gases from the exhaust pipe of the furnace flue to the lower cavity in the bottom of the drying chamber and into the condensate cleaning unit after they pass through the lower cavity are designed in the form of the first exhaust ventilator (smoke exhauster) located outside the drying chamber and condensate cleaning unit and connected to the outlet of the lower cavity in the bottom of the drying chamber and to the inlet of the condensate cleaning unit.
- first exhaust ventilator smoke exhauster
- the facilities that supply a portion of cooled and humidified air from the upper part of the free internal space of the drying chamber into the condensate cleaning unit are designed in the form of the second exhaust ventilator located outside the drying chamber and the condensate cleaning unit and connected to both of them.
- the facilities that bleed a portion of cooled and humidified air from the upper part of the free internal space of the drying chamber and supply it into the furnace flue are designed in the form of the third exhaust ventilator connected both to the drying chamber and the furnace flue so as to provide the closed air circulation from the upper part of the free internal space of the drying chamber into the furnace flue and from the furnace flue into the upper cavity in the bottom of the drying chamber and further into the free internal space of the drying chamber.
- a casing of the third exhaust ventilator is connected to an outgoing pipe intended to discharge into atmosphere moisture which is accumulated on the internal surface of the casing as a result of condensation of cooled and humidified air bled by the third exhaust ventilator from the upper part of the free internal space of the drying chamber.
- the outgoing pipe is equipped with a shutter to adjust humidity conditions of the drying process.
- the furnace flue contains a pipe where the air is heated by the furnace gases and then fed into the drying chamber and backwards, thus supporting the process of drying.
- the pipe is curved many times to increase the way and time for the air to go through the furnace flue, enabling maximum heat transfer from the furnace gases to the air in the pipe.
- a shutter for adjusting temperature conditions of the drying process is installed in the channel, designed for forced air supplying from the upper free space of the drying chamber into the furnace flue.
- the lower cavity in the bottom of the drying chamber is equipped with at least two partitions to provide labyrinth passing of furnace gases. It increases heat emission from the furnace gases to the walls of the lower cavity, and therefore, provides additional heating of the drying chamber.
- the air distribution channels are perpendicular to the direction of the heated airflow fed into the upper cavity in the bottom of the drying chamber. These channels are located between and along the areas for placing the material to be dried; each air distribution channel is separated with a vertical partition from an adjacent area for placing the material to be dried.
- the areas for placing the material to be dried are located on/above the upper surface of the diathermic partition between the upper and lower cavities in the bottom of the drying chamber so as to allow heated air to pass through the material to be dried while moving up to the upper part of the free internal space of the drying chamber.
- the areas for placing the material to be dried are equipped with the vertical partitions to direct and distribute the heated air. First, the heated air passes the free space of the upper cavity in the bottom of the drying chamber through the air distribution channels, and then it is supplied to the material being dried.
- the through holes In the upper surface of the upper cavity in the bottom of the drying chamber, close to one of its lateral walls, there are the through holes, which provide additional hot air supply from the upper cavity in the bottom of the drying chamber into the free internal space of the drying chamber.
- the through holes are made near the ends of the piles.
- the condensate cleaning unit is designed in the form of a hollow reservoir to ensure condensation on its internal walls, when cooled and humidified air fed from the upper part of the free internal space of the drying chamber gets mixed up with the furnace gases from the lower cavity in the bottom of the drying chamber.
- the power capacity of the third exhaust ventilator is higher than the power capacity of the second exhaust ventilator.
- the volume of the free internal space of the drying chamber determines the values and ratios of the power capacities of the second and third ventilators.
- the drying plant consists of the heat-insulated drying chamber (1) with the free internal space (2), the furnace (3) located close to the drying chamber (1), the bottom of the drying chamber (4) that is designed with two cavities (5 and 6), horizontally arranged and separated from each other by the hermetic partition (7) made of diathermic material.
- the lower cavity (5) in the bottom (4) of the drying chamber (1) is designed in such a way as to provide forced feeding of furnace gases into the cavity (5) from the exhaust pipe (8) of the furnace flue (9).
- the upper cavity (6) in the bottom (4) of the drying chamber (1) is designed in such a way as to provide feeding of the air (drying agent) heated in the furnace flue (9) into said cavity (6); in the upper cavity (6), the heated air is distributed among the air distribution channels (10) to interact with the material to be dried located in the free internal space of the drying chamber (1).
- the air drying agent
- the heated air is distributed among the air distribution channels (10) to interact with the material to be dried located in the free internal space of the drying chamber (1).
- the drying plant is equipped with the condensate cleaning unit (11) located outside the drying chamber (1); furnace gases are forcedly fed into the cleaning unit (11) from the exhaust pipe (8) of the furnace flue (9) after they pass through the lower cavity (5) in the bottom (4) of the drying chamber (1); also, a portion of the air cooled and humidified during drying is forcedly fed into the cleaning unit (11) from the upper part of the free internal space of the drying chamber (1) for mixing up with the furnace gases to form a condensate; subsequently, purified air is exhausted into atmosphere.
- the facilities that forcedly supply furnace gases from the exhaust pipe (8) of the furnace flue (9) into the lower cavity (5) in the bottom of the drying chamber (1) and into the condensate cleaning unit (11) after they pass through the lower cavity (5), are designed in the form of the first exhaust ventilator (12) located outside the drying chamber (1) and condensate cleaning unit (11), and connected to the outlet (13) of the lower cavity (5) in the bottom (4) of the drying chamber (1) and to the inlet (14) of the condensate cleaning unit (11).
- the facilities that supply a portion of cooled and humidified air from the upper part of the free internal space (2) of the drying chamber (1) into the condensate cleaning unit (11) are designed in the form of the second exhaust ventilator (15) located outside the drying chamber (1) and the condensate cleaning unit (11) and connected to both of them.
- the facilities that bleed a portion of cooled and humidified air from the upper part of the free internal space (2) of the drying chamber (1) and supply it into the furnace flue (9) are designed in the form of the third exhaust ventilator (16) connected both to the drying chamber (1) and the furnace flue (9) so as to provide the closed air circulation from the upper part of the free internal space (2) of the drying chamber (1) into the furnace flue (9) and from the furnace flue (9) into the upper cavity (6) in the bottom (4) of the drying chamber (1) and further into the free internal space (2) of the drying chamber (1).
- the casing (17) of the third exhaust ventilator (16) is connected to the outgoing pipe (18) intended to discharge into atmosphere moisture, which is accumulated on the internal surface of the casing (17) as a result of condensation of water vapor in the cooled air, bled by the third exhaust ventilator (16) from the upper part of the free internal space (2) of the drying chamber (1).
- the outgoing pipe (18) is equipped with the shutter (19) to adjust humidity conditions of the drying process.
- the furnace flue (9) contains the pipe (20), where the air is heated by the furnace gases and then fed into the drying chamber (1) and backwards.
- the pipe (20) is curved many times to increase the way and time for the air to go through the furnace flue (9).
- the shutter (22) for adjusting temperature conditions of the drying process is installed in the channel (21), designed for air supplying into the furnace flue (9) and further into the upper cavity (6) in the bottom (4) of the drying chamber (1).
- the lower cavity (5) in the bottom (4) of the drying chamber (1) is equipped with at least two partitions (23) to provide labyrinth passing of furnace gases in the lower cavity (5) in the bottom (4) of the drying chamber (1).
- the air distribution channels (10) are located between and along the areas for placing the material to be dried. Each air distribution channel (10) is separated with a vertical partition (25) from an adjacent area (24) for placing the material to be dried.
- the areas (24) for placing the material to be dried are located on/above the upper surface of the diathermic partition, which separates the lower (5) and upper (6) cavities in the bottom (4) of the drying chamber (1) so as to allow heated air to pass through the material to be dried; the heated air is moving up to the upper part of the free internal space (2) of the drying chamber (1).
- the areas for placing the material to be dried (24) are equipped with vertical partitions (26) to direct and distribute the heated air incoming from the pipe (20) of the furnace flue (9) via the inlet (27) of the upper cavity (6) in the bottom (4) of the drying chamber (1) through the air distribution channels (10).
- Additional heated air supply to the material being dried is provided via the through holes (29) in the vertical partitions (25) that separate the areas for placing the material to be dried (24) from the air distribution channels (10).
- These holes (29) have different diameters that increase along the way of heated air passage via the air distribution channels (10).
- the through holes (30) In the upper surface of the upper cavity (6) in the bottom of the drying chamber, close to one of its lateral walls, there are the through holes (30), which provide additional hot air supply from the upper cavity (6) in the bottom (4) of the drying chamber (1) into the free internal space (2) of the drying chamber (1).
- the piles In case the drying chamber (1) is used for drying saw-timber piles, the piles are located in the drying chamber (1) along the air distribution channels (10) so that the ends of the piles are opposite to said through holes (30).
- the condensate cleaning unit (11) is designed in the form of a hollow reservoir to ensure condensation on its internal walls when cooled and humidified air fed from the upper part of the free internal space (2) of the drying chamber (1) gets mixed up with the furnace gases from the lower cavity (5) in the bottom (4) of the drying chamber (1).
- the power capacity of the third exhaust ventilator (16) relates to the power capacity of the second exhaust ventilator (15) as 10:1.
- the operation of the proposed drying plant may be demonstrated with an example of implementing the method of drying wood, namely, saw-timber stacked in piles.
- the furnace (3) is put in operation by igniting the fuel (woodworking waste products) in the combustion chamber. Simultaneously, the first exhaust ventilator (12) is turned on. The saw-timber stacked in piles is placed in the specially arranged areas (24) in the free internal space (2) of the drying chamber (1). After the drying chamber (1) is loaded and its doors, equipped with appropriate seals, are hermetically locked, the second (15) and third (16) exhaust ventilators are turned on. At this time, the shutter (19) in the outgoing pipe (18), connected to the casing (17) of the third exhaust ventilator, (16) is shut. When the temperature and humidity in the drying chamber (1) reach required values the shutter (19) should be opened. Then, the drying plant runs in a set mode of operation. The only maintenance required is to load fuel in the combustion chamber and remove ashes in time.
- the drying agent i.e. the air heated by the furnace gases in the pipes (20) located in the furnace flue (9) enters the upper cavity (6) in the bottom (4) of the drying chamber (1) through the channel (21), and then goes through the air distribution channels (10) to the areas (24), where it passes through the piles of the material to be dried, then the air goes up to the top of the drying chamber (1), where it is partially bled by the second (15) and the third (16) exhaust ventilators.
- the proposed and described above location of the air distribution channels (10), relative to the areas for placing the material to be dried (24) and relative to the direction of heated air entering the upper cavity (6) in the bottom (4) of the drying chamber (1), ensures uniform distribution of heated air among the piles.
- Uniform distribution of heated air is also insured by additional supply of heated air to the piles via the through holes (30) in the upper surface of the upper cavity (6) in the bottom (4) of the drying chamber (1) and/or via the through holes (29) in the vertical partitions (25), which separate the areas for placing the material to be dried (24) from the air distribution channels (10).
- the air is circling in a closed circuit sequentially passing through the pipes (20) located in the furnace flue (9), the inlet part of the channel (21), the upper cavity (6) in the bottom (4) of the drying chamber (1) with its air distribution channels (10), then through the piles (in case saw-timber is dried) the air goes up to the upper part of the free internal space (2) of the drying chamber (1), and then again it passes through the channel (21) into the pipes (20) located in the furnace flue (9), etc.
- convectional drying of wet materials with heated air is realized in the drying chamber (1). While moving up to the upper part of the free internal space (2) of the drying chamber (1) and contacting the material to be dried, heated air becomes wet and partially cools down, because some heat is consumed for moisture evaporation and wood heating.
- a part of cooled and humidified air from the upper part of the free internal space (2) of the drying chamber (1) is fed by the second exhaust ventilator (15) to the condensate cleaning unit (11), where it gets mixed up with the furnace gases supplied to the unit (11) by the first exhaust ventilator (12).
- the furnace gases pass through the lower cavity in the bottom (4) of the drying chamber (1), heating said chamber (1).
- Humidity conditions of the drying process can be adjusted by opening up the shutter (19) in the outgoing pipe (18), through which the condensate, forming on the internal surface of the casing of the third exhaust ventilator (16), when cooled and humidified air passes through the ventilator (16) from the upper part of the free internal space (2) of the drying chamber (1), is discharged into atmosphere.
- Temperature conditions of the drying process can be regulated by adjusting the amount of heated air supply from the pipes (20) located in the furnace flue (9) to the drying chamber, temperature conditions can also be regulated by adjusting the temperature of heated air that depends on the intensity of fuel burning in the furnace (3).
- the proposed drying plant and wood-drying method ensure a highly productive, cost-effective and nonpolluting drying process.
- the heated air moves from the bottom to the top of the drying chamber (1), thus ensuring maximum heat transfer to the material being dried without any loss.
- Such air-moving does not require any additional power-consuming devices, since the heated air is lighter in weight than the cold air, and the air humidified during elevation is lighter in weight than the dry air at the same temperature.
- Supplying heated air to the material being dried through the proposed and described air distribution channels (10) of the upper cavity (6) in the bottom (4) of the drying chamber (1) provides the uniform distribution of heated air among the material being dried (especially, in case saw-timber is being dried) located in the specially arranged areas (24).
Abstract
The invention relates to drying equipment and can be used in wood and
wood treatment industries, etc., whenever parameters and procedures
necessary to dry materials such as wood are used. The invention allows the
drying process to achieve a higher degree of environmental protection, a
larger product output and power saving features on the account of the
following design of the plant: the drying chamber (1) which contains the
material to be dried includes a bottom (4) which has two cavities (5,6); hot
combustion products are injected into one of these cavities (5) from the flue
pipe (9) of the furnace (3) which is used to burn wood waste; hot air is
supplied into the other cavity (6), whereby said air is heated in pipes which
are located in the flue (9), and is used as a drying agent. The hot drying agent
is supplied from the cavity (6) in the bottom and circulates through air
distribution channels in the lower part of the drying chamber (1) where it
passes through the material to be dried and rises in the top portion of the
internal open space of the drying chamber (1). From that point, one part of
the drying agent is fed into a closed circuit in the flue (9) of the furnace and is
heated therein, and the other part of said drying agent is directed into a
condensate cleaning unit (11) where it is mixed with furnace gases and
purifies these gases by condensation.
Description
The invention relates to drying equipment and can be used in timber
industry, woodworking and other branches of industry, whenever parameters
and procedures necessary to dry materials as wood are used.
Drying plants are known from prior art that include a batch-operating
drying chamber and a furnace located near it, in which woodworking waste
products may be and are primarily used as fuel to generate heat necessary
for drying. Usually, the furnace gases or a mixture of furnace gases with air
are used in such systems (e.g., see, Spravochnik po sushke drevesiny
(Wood-drying reference book) edited by E.S. Bogdanov, Moscow, Lesnaya
promyshlennost, 1990, pp. 38-63, patent RU 2105941, and the following
inventor's certificates: SU:380454, JP09223628, JP11094460, JP11201639,
JP11241883). While using those systems, accompanying problems inevitably
appear due to the following facts. Gaseous combustion products of high-temperature
wood burning consist largely of CO2, H2O and nitrogen oxides
NOx. The situation becomes much more complicated when an incomplete fuel
combustion takes place, because in this case the combustion products are
fouled not only with soot (i.e., unburned carbon particles), but also with dry
distillation products as well, consisting of CO and a number of hydrocarbons,
which are usually chemically active, smell specifically, have relatively low
temperatures of boiling, etc. Furthermore, there is a risk of environmental
pollution due to a possible formation of dioxins and furans as a result of
condensation reactions, when gaseous products of wood burning are cooled
with the presence of even minimal amounts of chlorine (although furnace
ashes do not contain these products).
As a result, to ensure ecological safety of the drying plants and to
produce high-quality dry wood materials, considerable expenses are required
to purify combustion products and drying agents. Besides, special devices
are required to provide necessary drying conditions (e.g., different humidifiers
or steam generators are used to maintain the necessary level of humidity),
resulting in a sophisticated design, higher prices and complicated
maintenance. Nevertheless, neither the measures taken nor considerable
expenses can guarantee either necessary ecological safety or high quality of
dried materials.
The subject of the present invention is to ensure higher ecological
safety and provide a highly productive, power-saving drying process, allowing
to produce high quality dried materials. The proposed drying plant is not
expensive, simple in maintenance and does not require highly qualified
personnel. The drying plant can be installed either in existing premises or in
the form of a separate premise, e.g. at lumbering sites.
The proposed drying method is as follows: stack the wood into the free
internal space of the drying chamber, close the chamber, and supply a hot
drying agent (the air heated in the pipes located in the furnace flue) into the
chamber. The woodworking waste products are the primary fuel used in the
furnace. The air is forcedly circulated from pipes located in the furnace flue to
the lower part of the free internal space of the drying chamber, and from the
upper part of the free internal space of the drying chamber into the pipes of
the furnace flue, and backwards. During drying, a portion of cooled and
humidified air from the upper part of the free internal space of the drying
chamber is forcedly supplied into the condensate cleaning unit, where it is
mixed with the furnace gases, which are also forcedly supplied into the unit
for purification; on their way to the cleaning unit, the furnace gases pass
through a cavity located in the bottom of the drying chamber providing
additional heating of the chamber. Air circulation from the pipes of the furnace
flue to the lower part of the free internal space of the drying chamber and
from its upper part into the pipes located in the furnace flue, and forced
supply of furnace gases through an exhaust pipe into the cavity in the bottom
of the drying chamber and then into the condensate cleaning unit, as well as
forced supply of a portion of cooled and humidified air from the upper part of
the free internal space of the drying chamber into the condensate cleaning
unit, is realized with the aid of three appropriate exhaust ventilators. The
pressure in the free internal space of the drying chamber falls slightly during
drying. Humidity conditions can be adjusted by releasing vapor from the
upper part of the free internal space of the drying chamber into atmosphere.
Temperature conditions can be regulated by adjusting air circulation
intensity from the pipes of the furnace flue to the lower part of the free internal
space of the drying chamber and from the upper part of the free internal
space of the drying chamber into the pipes; temperature conditions can also
be regulated by adjusting the temperature of the drying agent (air), which
depends on burning intensity and the amount of fuel in the furnace.
The proposed method for drying wood may be realized as a drying
plant consisting of a heat-insulated drying chamber with a free internal space,
a furnace located close to the drying chamber, and facilities for supplying
drying agent from the furnace into the drying chamber. The bottom of drying
chamber is designed with two cavities horizontally arranged and hermetically
separated from each other. The partition between these cavities is made of
diathermic material. The lower cavity in the bottom of the drying chamber is
designed in such a way as to provide forced feeding of furnace gases into the
cavity from the exhaust pipe of the furnace flue. The upper cavity located in
the bottom of the drying chamber is designed in such a way as to provide
supply of the air heated in the furnace flue into the cavity; in the upper cavity,
the heated air is distributed among air distribution channels to interact with
the material to be dried located in the free internal space of the drying
chamber at specially arranged places. There is a possibility to provide forced
feeding of a portion of the air cooled and humidified during drying from the
upper part of the free internal space of the drying chamber into the furnace
flue. Besides, the drying plant is equipped with a condensate cleaning unit
located outside the drying chamber; the furnace gases are forcedly fed into
the unit after they pass through the lower cavity in the bottom of the drying
chamber; also, a portion of cooled and humidified air is forcedly fed into the
unit from the upper part of the free internal space of the drying chamber for
mixing up with the furnace gases to form a condensate; after that, the purified
air is exhausted into atmosphere.
The facilities that forcedly supply furnace gases from the exhaust pipe
of the furnace flue to the lower cavity in the bottom of the drying chamber and
into the condensate cleaning unit after they pass through the lower cavity, are
designed in the form of the first exhaust ventilator (smoke exhauster) located
outside the drying chamber and condensate cleaning unit and connected to
the outlet of the lower cavity in the bottom of the drying chamber and to the
inlet of the condensate cleaning unit.
The facilities that supply a portion of cooled and humidified air from the
upper part of the free internal space of the drying chamber into the
condensate cleaning unit are designed in the form of the second exhaust
ventilator located outside the drying chamber and the condensate cleaning
unit and connected to both of them.
The facilities that bleed a portion of cooled and humidified air from the
upper part of the free internal space of the drying chamber and supply it into
the furnace flue are designed in the form of the third exhaust ventilator
connected both to the drying chamber and the furnace flue so as to provide
the closed air circulation from the upper part of the free internal space of the
drying chamber into the furnace flue and from the furnace flue into the upper
cavity in the bottom of the drying chamber and further into the free internal
space of the drying chamber.
A casing of the third exhaust ventilator is connected to an outgoing pipe
intended to discharge into atmosphere moisture which is accumulated on the
internal surface of the casing as a result of condensation of cooled and
humidified air bled by the third exhaust ventilator from the upper part of the
free internal space of the drying chamber. The outgoing pipe is equipped with
a shutter to adjust humidity conditions of the drying process. The furnace flue
contains a pipe where the air is heated by the furnace gases and then fed into
the drying chamber and backwards, thus supporting the process of drying.
The pipe is curved many times to increase the way and time for the air to go
through the furnace flue, enabling maximum heat transfer from the furnace
gases to the air in the pipe.
A shutter for adjusting temperature conditions of the drying process is
installed in the channel, designed for forced air supplying from the upper free
space of the drying chamber into the furnace flue.
The lower cavity in the bottom of the drying chamber is equipped with at
least two partitions to provide labyrinth passing of furnace gases. It increases
heat emission from the furnace gases to the walls of the lower cavity, and
therefore, provides additional heating of the drying chamber.
The air distribution channels are perpendicular to the direction of the
heated airflow fed into the upper cavity in the bottom of the drying chamber.
These channels are located between and along the areas for placing the
material to be dried; each air distribution channel is separated with a vertical
partition from an adjacent area for placing the material to be dried.
The areas for placing the material to be dried are located on/above the
upper surface of the diathermic partition between the upper and lower cavities
in the bottom of the drying chamber so as to allow heated air to pass through
the material to be dried while moving up to the upper part of the free internal
space of the drying chamber. The areas for placing the material to be dried
are equipped with the vertical partitions to direct and distribute the heated air.
First, the heated air passes the free space of the upper cavity in the bottom of
the drying chamber through the air distribution channels, and then it is
supplied to the material being dried.
There is an additional possibility to supply heated air to the material
being dried via the through holes in the vertical partitions that separate the
areas for placing the material to be dried from the air distribution channels.
These holes have different diameters that increase along the way of heated
air passage via the air distribution channels. These holes are equipped with
shutters.
In the upper surface of the upper cavity in the bottom of the drying
chamber, close to one of its lateral walls, there are the through holes, which
provide additional hot air supply from the upper cavity in the bottom of the
drying chamber into the free internal space of the drying chamber. In case the
drying chamber is used for drying saw-timber piles, which is located along the
air distribution channels, the through holes are made near the ends of the
piles.
When the drying chamber is not completely loaded, it is possible to
close the air distribution channel adjacent to the area for placing the material
to be dried, which contains no material.
The condensate cleaning unit is designed in the form of a hollow
reservoir to ensure condensation on its internal walls, when cooled and
humidified air fed from the upper part of the free internal space of the drying
chamber gets mixed up with the furnace gases from the lower cavity in the
bottom of the drying chamber.
The power capacity of the third exhaust ventilator is higher than the
power capacity of the second exhaust ventilator. The volume of the free
internal space of the drying chamber determines the values and ratios of the
power capacities of the second and third ventilators.
The design of the proposed drying plant is illustrated in the following
figures:
The drying plant consists of the heat-insulated drying chamber (1) with
the free internal space (2), the furnace (3) located close to the drying
chamber (1), the bottom of the drying chamber (4) that is designed with two
cavities (5 and 6), horizontally arranged and separated from each other by
the hermetic partition (7) made of diathermic material. The lower cavity (5) in
the bottom (4) of the drying chamber (1) is designed in such a way as to
provide forced feeding of furnace gases into the cavity (5) from the exhaust
pipe (8) of the furnace flue (9). The upper cavity (6) in the bottom (4) of the
drying chamber (1) is designed in such a way as to provide feeding of the air
(drying agent) heated in the furnace flue (9) into said cavity (6); in the upper
cavity (6), the heated air is distributed among the air distribution channels
(10) to interact with the material to be dried located in the free internal space
of the drying chamber (1). There is a possibility to provide forced feeding of a
portion of the air, being cooled and humidified during drying, from the upper
part of the drying chamber (1) into the furnace flue (9). The drying plant is
equipped with the condensate cleaning unit (11) located outside the drying
chamber (1); furnace gases are forcedly fed into the cleaning unit (11) from
the exhaust pipe (8) of the furnace flue (9) after they pass through the lower
cavity (5) in the bottom (4) of the drying chamber (1); also, a portion of the air
cooled and humidified during drying is forcedly fed into the cleaning unit (11)
from the upper part of the free internal space of the drying chamber (1) for
mixing up with the furnace gases to form a condensate; subsequently,
purified air is exhausted into atmosphere.
The facilities that forcedly supply furnace gases from the exhaust pipe
(8) of the furnace flue (9) into the lower cavity (5) in the bottom of the drying
chamber (1) and into the condensate cleaning unit (11) after they pass
through the lower cavity (5), are designed in the form of the first exhaust
ventilator (12) located outside the drying chamber (1) and condensate
cleaning unit (11), and connected to the outlet (13) of the lower cavity (5) in
the bottom (4) of the drying chamber (1) and to the inlet (14) of the
condensate cleaning unit (11).
The facilities that supply a portion of cooled and humidified air from the
upper part of the free internal space (2) of the drying chamber (1) into the
condensate cleaning unit (11) are designed in the form of the second exhaust
ventilator (15) located outside the drying chamber (1) and the condensate
cleaning unit (11) and connected to both of them.
The facilities that bleed a portion of cooled and humidified air from the
upper part of the free internal space (2) of the drying chamber (1) and supply
it into the furnace flue (9) are designed in the form of the third exhaust
ventilator (16) connected both to the drying chamber (1) and the furnace flue
(9) so as to provide the closed air circulation from the upper part of the free
internal space (2) of the drying chamber (1) into the furnace flue (9) and from
the furnace flue (9) into the upper cavity (6) in the bottom (4) of the drying
chamber (1) and further into the free internal space (2) of the drying chamber
(1). The casing (17) of the third exhaust ventilator (16) is connected to the
outgoing pipe (18) intended to discharge into atmosphere moisture, which is
accumulated on the internal surface of the casing (17) as a result of
condensation of water vapor in the cooled air, bled by the third exhaust
ventilator (16) from the upper part of the free internal space (2) of the drying
chamber (1). The outgoing pipe (18) is equipped with the shutter (19) to
adjust humidity conditions of the drying process. The furnace flue (9) contains
the pipe (20), where the air is heated by the furnace gases and then fed into
the drying chamber (1) and backwards. The pipe (20) is curved many times to
increase the way and time for the air to go through the furnace flue (9).
The shutter (22) for adjusting temperature conditions of the drying
process is installed in the channel (21), designed for air supplying into the
furnace flue (9) and further into the upper cavity (6) in the bottom (4) of the
drying chamber (1).
The lower cavity (5) in the bottom (4) of the drying chamber (1) is
equipped with at least two partitions (23) to provide labyrinth passing of
furnace gases in the lower cavity (5) in the bottom (4) of the drying chamber
(1). The air distribution channels (10) are located between and along the
areas for placing the material to be dried. Each air distribution channel (10) is
separated with a vertical partition (25) from an adjacent area (24) for placing
the material to be dried.
The areas (24) for placing the material to be dried are located on/above
the upper surface of the diathermic partition, which separates the lower (5)
and upper (6) cavities in the bottom (4) of the drying chamber (1) so as to
allow heated air to pass through the material to be dried; the heated air is
moving up to the upper part of the free internal space (2) of the drying
chamber (1).
The areas for placing the material to be dried (24) are equipped with
vertical partitions (26) to direct and distribute the heated air incoming from the
pipe (20) of the furnace flue (9) via the inlet (27) of the upper cavity (6) in the
bottom (4) of the drying chamber (1) through the air distribution channels
(10). There is a possibility to supply the heated air to the material being dried
located in the specially arranged areas (24) after it passes the air distribution
channels (10) through the free space (28) of the upper cavity (6) in the bottom
(4) of the drying chamber (1), which is adjacent to the ends of the areas for
placing the material to be dried (24). Additional heated air supply to the
material being dried is provided via the through holes (29) in the vertical
partitions (25) that separate the areas for placing the material to be dried (24)
from the air distribution channels (10). These holes (29) have different
diameters that increase along the way of heated air passage via the air
distribution channels (10). In the upper surface of the upper cavity (6) in the
bottom of the drying chamber, close to one of its lateral walls, there are the
through holes (30), which provide additional hot air supply from the upper
cavity (6) in the bottom (4) of the drying chamber (1) into the free internal
space (2) of the drying chamber (1). In case the drying chamber (1) is used
for drying saw-timber piles, the piles are located in the drying chamber (1)
along the air distribution channels (10) so that the ends of the piles are
opposite to said through holes (30).
When the drying chamber (1) is not completely loaded, it is possible to
close the air distribution channel (10) adjacent to the area for placing the
material to be dried, which contains no material.
The condensate cleaning unit (11) is designed in the form of a hollow
reservoir to ensure condensation on its internal walls when cooled and
humidified air fed from the upper part of the free internal space (2) of the
drying chamber (1) gets mixed up with the furnace gases from the lower
cavity (5) in the bottom (4) of the drying chamber (1). The power capacity of
the third exhaust ventilator (16) relates to the power capacity of the second
exhaust ventilator (15) as 10:1.
The operation of the proposed drying plant may be demonstrated with
an example of implementing the method of drying wood, namely, saw-timber
stacked in piles.
The furnace (3) is put in operation by igniting the fuel (woodworking
waste products) in the combustion chamber. Simultaneously, the first exhaust
ventilator (12) is turned on. The saw-timber stacked in piles is placed in the
specially arranged areas (24) in the free internal space (2) of the drying
chamber (1). After the drying chamber (1) is loaded and its doors, equipped
with appropriate seals, are hermetically locked, the second (15) and third (16)
exhaust ventilators are turned on. At this time, the shutter (19) in the outgoing
pipe (18), connected to the casing (17) of the third exhaust ventilator, (16) is
shut. When the temperature and humidity in the drying chamber (1) reach
required values the shutter (19) should be opened. Then, the drying plant
runs in a set mode of operation. The only maintenance required is to load fuel
in the combustion chamber and remove ashes in time.
During the operation of the drying plant, the drying agent, i.e. the air
heated by the furnace gases in the pipes (20) located in the furnace flue (9),
enters the upper cavity (6) in the bottom (4) of the drying chamber (1) through
the channel (21), and then goes through the air distribution channels (10) to
the areas (24), where it passes through the piles of the material to be dried,
then the air goes up to the top of the drying chamber (1), where it is partially
bled by the second (15) and the third (16) exhaust ventilators. The proposed
and described above location of the air distribution channels (10), relative to
the areas for placing the material to be dried (24) and relative to the direction
of heated air entering the upper cavity (6) in the bottom (4) of the drying
chamber (1), ensures uniform distribution of heated air among the piles.
Uniform distribution of heated air is also insured by additional supply of
heated air to the piles via the through holes (30) in the upper surface of the
upper cavity (6) in the bottom (4) of the drying chamber (1) and/or via the
through holes (29) in the vertical partitions (25), which separate the areas for
placing the material to be dried (24) from the air distribution channels (10).
During the operation of the drying plant, due to the action of the third
exhaust ventilator (16), the air is circling in a closed circuit sequentially
passing through the pipes (20) located in the furnace flue (9), the inlet part of
the channel (21), the upper cavity (6) in the bottom (4) of the drying chamber
(1) with its air distribution channels (10), then through the piles (in case saw-timber
is dried) the air goes up to the upper part of the free internal space (2)
of the drying chamber (1), and then again it passes through the channel (21)
into the pipes (20) located in the furnace flue (9), etc. Thus, convectional
drying of wet materials with heated air is realized in the drying chamber (1).
While moving up to the upper part of the free internal space (2) of the drying
chamber (1) and contacting the material to be dried, heated air becomes wet
and partially cools down, because some heat is consumed for moisture
evaporation and wood heating.
During drying, a part of cooled and humidified air from the upper part of
the free internal space (2) of the drying chamber (1) is fed by the second
exhaust ventilator (15) to the condensate cleaning unit (11), where it gets
mixed up with the furnace gases supplied to the unit (11) by the first exhaust
ventilator (12). On the way to the condensate cleaning unit (11) the furnace
gases pass through the lower cavity in the bottom (4) of the drying chamber
(1), heating said chamber (1).
Humidity conditions of the drying process can be adjusted by opening
up the shutter (19) in the outgoing pipe (18), through which the condensate,
forming on the internal surface of the casing of the third exhaust ventilator
(16), when cooled and humidified air passes through the ventilator (16) from
the upper part of the free internal space (2) of the drying chamber (1), is
discharged into atmosphere.
Temperature conditions of the drying process can be regulated by
adjusting the amount of heated air supply from the pipes (20) located in the
furnace flue (9) to the drying chamber, temperature conditions can also be
regulated by adjusting the temperature of heated air that depends on the
intensity of fuel burning in the furnace (3).
The proposed drying plant and wood-drying method ensure a highly
productive, cost-effective and nonpolluting drying process.
The heated air moves from the bottom to the top of the drying chamber
(1), thus ensuring maximum heat transfer to the material being dried without
any loss. Such air-moving (from the bottom to the top of the drying chamber
(1)) does not require any additional power-consuming devices, since the
heated air is lighter in weight than the cold air, and the air humidified during
elevation is lighter in weight than the dry air at the same temperature. These
properties of air provide natural airflow and lay the foundation of operation of
the drying chamber (1) of the proposed drying plant.
Designing the drying chamber (1) equipped with a lower cavity (5) in its
bottom (4), which the furnace gases (smoke), formed during fuel burning in
the combustion chamber (1) of the furnace (3), pass through, allows to use
the warmth of the furnace gases for additional heating of the drying chamber
(1), promoting a higher cost-effectiveness of the proposed drying plant. And
subsequent condensate purification of cooled furnace gases ensures an
increased environmental safety of the proposed drying plant, which allows to
run it in any circumstances without environmental pollution, since there is
virtually no discharge of harmful substances into atmosphere.
Supplying heated air to the material being dried through the proposed
and described air distribution channels (10) of the upper cavity (6) in the
bottom (4) of the drying chamber (1) provides the uniform distribution of
heated air among the material being dried (especially, in case saw-timber is
being dried) located in the specially arranged areas (24).
The foregoing allows one to claim that the above listed advantages of
the proposed drying plant may be realized only by exploiting all its features as
a whole, each feature has its own function, whereas taken as a whole they
contribute solving the problem.
Claims (25)
- A drying plant, comprising a heat-insulated drying chamber with an internal space, a furnace located near the drying chamber, facilities for supplying a drying agent from the furnace to the drying chamber, distinctive in that the bottom of the drying chamber is designed with two cavities horizontally arranged and separated from each other by a hermetic partition made of diathermic material, the lower cavity in the bottom of the drying chamber is designed for forced feeding of furnace gases into the lower cavity from an exhaust pipe of a furnace flue, the upper cavity in the bottom of the drying chamber is designed for feeding of the air heated in the furnace flue into the upper cavity; in the upper cavity, the heated air, used as a drying agent, is distributed among air distribution channels to interact with a material to be dried, located in specially arranged areas in the internal space of the drying chamber; besides that, a portion of air, cooled and humidified during drying, may be forcedly fed from the upper part of the drying chamber into the furnace flue, the plant is also equipped with a condensate cleaning unit located outside the drying chamber, the condensate cleaning unit is forcedly fed with furnace gases after they pass through the lower cavity in the bottom of the drying chamber, the condensate cleaning unit is also fed with a portion of air, cooled and humidified during drying, from the upper part of the internal space of the drying chamber for mixing up with furnace gases to form a condensate and for subsequent exhausting of purified air.
- The drying plant according to claim 1, wherein the facilities for forced feeding of furnace gases from an exhaust pipe of the furnace flue into the lower cavity of the bottom of the drying chamber and into the condensate cleaning unit after said gases pass through the lower cavity, are designed in a form of a first exhaust ventilator, located outside the drying chamber and outside the condensate cleaning unit and connected to an outlet of the lower cavity of the bottom of the drying chamber and to an inlet of the condensate cleaning unit.
- The drying plant according to any one of claims 1-2, wherein the facilities for supplying a portion of cooled and humidified air from the upper part of the internal space of the drying chamber to the condensate cleaning unit are designed in a form of a second exhaust ventilator, located outside the drying chamber and outside the condensate cleaning unit and connected to both the drying chamber and the condensate cleaning unit.
- The drying plant according to any preceding claim, wherein the facilities for bleeding a portion of cooled and humidified air from the upper part of the internal space of the drying chamber and supplying said air into the furnace flue are designed in a form of a third exhaust ventilator connected to both the drying chamber and the furnace flue so as to provide closed air circulation from the upper part of the internal space of the drying chamber into the furnace flue and from the furnace flue into the upper cavity of the bottom of the drying chamber and further into the internal space of the drying chamber.
- The drying plant according to claim 4, wherein a casing of the third exhaust ventilator is connected to an outgoing pipe, designed to discharge into atmosphere moisture, which is accumulated on the internal surface of the casing as a result of condensation of cooled and humidified air, bled by the third exhaust ventilator from the upper part of the internal space of the drying chamber.
- The drying plant according to claim 5, wherein the outgoing pipe is equipped with a shutter to adjust humidity conditions of drying.
- The drying plant according to any preceding claim, wherein the furnace flue contains a pipe, where the air is heated by furnace gases and fed into the drying chamber and backwards providing the process of drying.
- The drying plant according to claim 7, wherein said pipe, located in the furnace flue, is curved many times to increase the way and time for the air to go through the furnace flue.
- The drying plant according to any preceding claim, wherein the shutter for adjusting required and assigned temperature conditions of drying is installed in a channel, used for supplying hot air from the furnace flue to the upper cavity of the bottom of the drying chamber.
- The drying plant according to any preceding claim, wherein the lower cavity of the bottom of the drying chamber is equipped with at least two partitions to provide labyrinth passing of furnace gases in the lower cavity of the bottom of the drying chamber.
- The drying plant according to any preceding claim, wherein the air distribution channels are located perpendicular to a heated airflow, entering the upper cavity of the bottom of the drying chamber, between and along areas for placing a material to be dried, each of the air distribution channels is separated with a vertical partition from an adjacent area for placing a material to be dried.
- The drying plant according to any preceding claim, wherein the areas for placing a material to be dried are located on or above the upper surface of the diathermic partition, which separates the lower and upper cavities in the bottom of the drying chamber so as to allow heated air to pass through a material being dried when said air is moving up to the upper part of the internal space of the drying chamber, the areas for placing a material to be dried are equipped with vertical partitions to direct and distribute heated air, incoming from the inlet of the upper cavity of the bottom of the drying chamber, among the air distribution channels.
- The drying plant according to any preceding claim, wherein heated air reaches a material to be dried after passing in the air distribution channels through the free space of the upper cavity of the bottom of the drying chamber, which constrains areas for placing a material to be dried.
- The drying plant according to any preceding claim, wherein heated air can be additionally supplied to a material being dried via through holes in the vertical partitions, which separate areas for placing a material to be dried from air distribution channels.
- The drying plant according to claim 14, wherein the diameters of said through holes increase along the way of heated air passage via an air distribution channel.
- The drying plant according to any one of claims 14-15, wherein said through holes are equipped with shutters.
- The drying plant according to any preceding claim, wherein through holes for additional heated air supply from the upper cavity of the bottom of the drying chamber to the internal space of the drying chamber are designed in the upper surface of the upper cavity of the bottom of the drying chamber and near one of the walls of the drying chamber.
- The drying plant according to claim 17, wherein, in case of drying saw-timber piles, the piles are located in the drying chamber along the air distribution channels so that the ends of said piles are opposite to said through holes.
- The drying plant according to any preceding claim, wherein, in case of partial loading of the drying chamber, it is possible to close the air distribution channel adjacent to any area for placing a material to be dried, which contains no material.
- The drying plant according to any preceding claim, wherein the condensate cleaning unit is designed in a form of a hollow reservoir to make possible condensation on the internal walls of the condensate cleaning unit, while cooled and humidified air, fed from the upper part of the internal space of the drying chamber, is mixing up with the furnace gases, fed from the lower cavity of the bottom of the drying chamber.
- The drying plant according to any preceding claim, wherein the power capacity of the third exhaust ventilator is higher than the power capacity of the second exhaust ventilator.
- The wood drying method, consisting of stacking wood into the internal space of the drying chamber, closing the drying chamber, and supplying a hot drying agent to the drying chamber; a fuel is being burnt in a combustion chamber of a furnace located near the drying chamber, distinctive in that the air, heated in the pipes located in the furnace flue, is used as the drying agent; said air is forcedly circulated from pipes located in the furnace flue to the lower part of the internal space of the drying chamber, and from the upper part of the internal space of the drying chamber to the pipes of the furnace flue, and backwards; during drying, a portion of cooled and humidified air is forcedly supplied from the upper part of the internal space of the drying chamber into the condensate cleaning unit, where said portion of air is mixing up with the furnace gases, which are forcedly supplied to the condensate cleaning unit for purification; on the way to the condensate cleaning unit, the furnace gases pass through a cavity, designed in the bottom of the drying chamber, heating said bottom.
- The wood drying method according to claim 22, wherein the air circulation from the pipes of the furnace flue to the lower part of the internal space of the drying chamber, and from the upper part of the internal space of the drying chamber to the pipes located in the furnace flue, and forced supply of furnace gases from the furnace flue through an exhaust pipe to the cavity of the bottom of the drying chamber and then to the condensate cleaning unit, and also forced supply of a portion of cooled and humidified air from the upper part of the internal space of the drying chamber to the condensate cleaning unit, is realized with the aid of three appropriate exhaust ventilators providing gradual decrease of pressure in the internal space of the drying chamber during drying.
- The wood-drying method according to any one of claims 22-23, wherein humidity conditions of drying are adjusted by releasing vapor from the upper part of the internal space of the drying chamber into atmosphere.
- The wood drying method according to any one of claims 22-24, wherein temperature conditions of drying are regulated by adjusting the amount of heated air supply from the pipes located in the furnace flue to the lower part of the internal space of the drying chamber, and also by adjusting the temperature of heated air, which depends on the intensity of fuel combustion in the furnace and on the amount of fuel being burnt.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU99122270/06A RU2153640C1 (en) | 1999-10-27 | 1999-10-27 | Drying complex and method of wood drying |
RU99122270 | 1999-10-27 | ||
PCT/RU2000/000419 WO2001031270A2 (en) | 1999-10-27 | 2000-10-24 | Drying plant and method for drying wood |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1260780A1 true EP1260780A1 (en) | 2002-11-27 |
Family
ID=20226143
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00975053A Withdrawn EP1260780A1 (en) | 1999-10-27 | 2000-10-24 | Drying plant and method for drying wood |
Country Status (6)
Country | Link |
---|---|
US (1) | US6725566B1 (en) |
EP (1) | EP1260780A1 (en) |
CA (1) | CA2388584A1 (en) |
NO (1) | NO20021989L (en) |
RU (1) | RU2153640C1 (en) |
WO (1) | WO2001031270A2 (en) |
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SU380454A1 (en) | 1971-01-13 | 1973-05-15 | Хозрасчетное экспериментальное производство разработке , изготовлению средств механизации строительстве | DRYER |
US4017254A (en) * | 1975-12-15 | 1977-04-12 | S. J. Agnew | Recirculating furnace-dryer combination |
US4520791A (en) * | 1982-03-22 | 1985-06-04 | Chamberlain Joseph G | Jacketed wood stove |
DE3637737A1 (en) * | 1986-11-05 | 1988-05-19 | Waldner Gmbh & Co Hermann | DRYERS, ESPECIALLY FOR THE CHEMICAL INDUSTRY |
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JP2516467B2 (en) | 1990-10-12 | 1996-07-24 | 石井 拓司 | Wood drying equipment |
AU702960B2 (en) * | 1994-10-12 | 1999-03-11 | Minoru Ando | Pit membrane-broken wood |
RU2102662C1 (en) * | 1995-12-07 | 1998-01-20 | Николай Георгиевич Конопасов | Recirculating drying plant |
JP2757170B2 (en) * | 1996-04-09 | 1998-05-25 | 有限会社山本家具製作所 | Wood treatment method and equipment |
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JPH11241883A (en) | 1998-02-24 | 1999-09-07 | Tsuneo Ito | Smoking/drying system for wood |
RU2134838C1 (en) * | 1999-01-14 | 1999-08-20 | Скроцкий Виктор Георгиевич | Furnace |
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1999
- 1999-10-27 RU RU99122270/06A patent/RU2153640C1/en not_active IP Right Cessation
-
2000
- 2000-10-24 CA CA002388584A patent/CA2388584A1/en not_active Abandoned
- 2000-10-24 WO PCT/RU2000/000419 patent/WO2001031270A2/en active Search and Examination
- 2000-10-24 EP EP00975053A patent/EP1260780A1/en not_active Withdrawn
- 2000-10-24 US US10/110,491 patent/US6725566B1/en not_active Expired - Fee Related
-
2002
- 2002-04-26 NO NO20021989A patent/NO20021989L/en not_active Application Discontinuation
Non-Patent Citations (1)
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2902866A1 (en) * | 2006-06-22 | 2007-12-28 | Giat Ind Sa | HOT GAS GENERATOR AND DRYING OR DEHYDRATION INSTALLATION USING SUCH A GENERATOR |
WO2007147961A3 (en) * | 2006-06-22 | 2008-03-20 | Nexter Munitions | Hot gas generator and drying or dehydratiion installation employing such a generator |
US8011113B2 (en) | 2006-06-22 | 2011-09-06 | Nexter Munitions | Hot gas generator and drying or dehydration facility implementing such a generator |
CN103968650A (en) * | 2013-02-01 | 2014-08-06 | 昆山尚达智机械有限公司 | Wood drying kiln |
CN105135833A (en) * | 2015-08-25 | 2015-12-09 | 重庆市合川区环宇配件厂 | Drying oven for automobile accessories |
CN105135833B (en) * | 2015-08-25 | 2017-05-31 | 重庆市合川区环宇配件厂 | Automobile fitting baking oven |
CN106018055A (en) * | 2016-06-27 | 2016-10-12 | 长沙开元仪器股份有限公司 | Drying oven for protective gas |
Also Published As
Publication number | Publication date |
---|---|
NO20021989L (en) | 2002-06-26 |
US6725566B1 (en) | 2004-04-27 |
CA2388584A1 (en) | 2001-05-03 |
WO2001031270A3 (en) | 2001-06-14 |
NO20021989D0 (en) | 2002-04-26 |
WO2001031270A2 (en) | 2001-05-03 |
RU2153640C1 (en) | 2000-07-27 |
WO2001031270A8 (en) | 2002-06-27 |
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